Laravel: how to display hidden model attribute

Let's say, we have hidden attribute in our Model settings but we want to show it in specific query results only.  How to do that?

OK, our hidden attribute is 'created_at'

                    protected $hidden = ['created_at']
                  

And now we are getting our model and ofcourse this field was not returned:

                    $user = User::where('slug','=',$slug)->first();
                  

And if we want to make visible created_at just for this results, we can do something like this:

                    $user = User::where('slug','=',$slug)->first();
$user->makeVisible(['created_at']);