The Kryptonite Key Safe program allows you to get spare keys cut, should you loose the spare keys to your Kryptonite lock.
When you received the kryptonite lock it will have come with numbered keys. Older kryptonite locks came with a key fob which had the key number on it. Newer Kryptonite locks have the key code directly on the key, which you hopefully made note of.
Have a good look around and see if you can find the code. If you can’t find it it’s unlikely that you’ll be able to replacement keys cut.
The link below will take you to the Kryptonite page, where you can begin the key cutting process.