View extended details for a single public SSH key. Requires that you are
authenticated via Basic Auth or via OAuth with at least read:public_key
scope.
GET /user/keys/:key_id
Status: 200 OK
{
"key_id": "012345678912345678",
"key": "2Sg8iYjAxxmI2LvUXpJjkYrMxURPc8r+dB7TJyvv1234"
}