Do Norton key cards expire by any chance?

The "prior prior" Thanksgiving, I got an Office 365 Personal key card for $49.99 which came with a Norton Security key card as part of the deal from Amazon.com. This past St. Patrick's Day, I replaced my Dell Inspiron 5537 with a Dell Inspiron 7558 because I wanted a laptop which came preloaded with Windows 10. I could not believe resetting my old Dell Inspiron 5537 brought it back to Windows 8.0, the operating system which caused me to be so eager about Windows 10's general availability on July 29, 2015. I made sure I got the free upgrade that day, and I shared the happiness with my cousins from New Jersey! I currently have a McAfee subscription activated on my Dell Inspiron 7558, which will protect my computer up to and including May 31, 2017, assuming they don't offer to extend my subscription by a week or so as a courtesy, which they usually do when you don't renew your subscription by the expiration date. I'm quite curious to know, if I uninstall McAfee when it stops protecting my computer a week or so after May 31, 2017, would I be able to activate the free trial from Norton, and when that expires, give them the product key printed on that key card so I can take advantage? I'm a little skeptical of software key cards. Even though there was no expiration date printed on that key card, I'm worried Norton could give me trouble about how long ago that key card was printed and refuse to honor the product key as if Amazon never offered it to me as a courtesy for buying one year of Office 365 for one device for $20 less than what I would have paid for it from Microsoft! This is why I'm not taking them up on one month of free Office 365 if I enable automatic renewal, because like a lot of stuff people around the world take interest in buying and having mailed to their door, Amazon often has Office 365 key cards at a discount. Successful people hardly ever buy anything at full price, especially not software licenses! And besides everything, Norton Security doesn't support the new Edge browser which replaces Internet Explorer as the default browser in Windows. Will it support it come June or July of 2017? It might, and that only becomes more likely as time progresses and Internet Explorer goes the way of Internet Explorer 6, the browser which couldn't go out of support after the standard ten years because of how much better Windows XP was compared to its successor, Windows Vista!

I've rambled on long enough. The gist of this forum post is, I need someone to make sure a Norton Security key card bought over a year ago will still work as if it just arrived in the mail today. If it won't, maybe I'll look at Norton again in, I don't know, the next five years or so.