Have old private key, what do I do?

I have an old memory stick with a private key on it. 64 digits. I know what I saved on this stick, but it was years ago, so 0,01 of something that was disregarded back then might be worth a $50, er even $500 today — who knows.

Anyway, I want to confirm if theres any funds on here, and it seems awfully complicated to do so in a safe manner. Set up a script on an offline computer to decrypt elliptical curves in python? Bro..

What’s the, let’s say, second best way to do this? Is it really that awful to just input the private key into a wallet like metamask or something?

Edit: it’s likely ethereum!