I am not sure if such thing by default available in Mendix .
You can achieve this using deeplink . Create a deeplink for forgot password and add timestamp while sending the link and maintain the same . When user is hitting the link check if timestamp is before 10 min then redirect user to different page with expired message and give option to regenerate again .
In the MF Step1_ShowForgotPasswordPage you can change the attribute ValidUntill with for example
When changing content of an Appstore module you could consider to make a copy of the microflow and put it in a separate module because it will be overwritten when you reimport the module from the marketplace.