How do I silence incoming text ringtone with power button on s7 active

[AC Question]

I have a long text ring tone. I like to wear my phone on my belt clip. Is there a way to stop my text ring tone with the power button or volume key so I don't have to listen to the whole thing if I'm around people. I know about the smart mute. But I'd rather not have to take my phone out to stop the ring tone. Thanks