I don’t know a single shortcut, but does Ctrl-L Ctrl-C do what you want?

I do ⌘ + L to move focus to the url bar then ⌘ + C to copy

edit: apparently others have already said this and those comments just haven't gotten to my server yet

Besides what others have said with Ctrl+L then Ctrl+C, you could use an extension for custom shortcuts like this:

https://github.com/crittermike/shortkeys

https://www.shortkeys.app/

And I checked and their is an option that you can set to copy url of the page you are on.