You can get EPP code at GoDaddy by contacting them or following these steps:
Login to your GoDaddy account.
Go to the Domain Settings page.
Once you are there, select Get Authorization Code menu located in the Additional Settings section.
Completing these actions you will receive an email with your domain authorization code in just a few minutes. Now you will be able to transfer your domain to Hostinger :)
NOTE: You can also check this article for more information about the EPP code.