Melt butter in a large non-stick frying pan over medium heat. Add garlic and red pepper flakes and cook for 20 seconds. Add broccoli and stir until combined. Cover and cook for 3 minutes, or until broccoli is almost cooked through.
Add shrimp and salt to the frying pan and stir until combined. Cook for 2 minutes, or until the shrimp is evenly heated through. Add more salt to taste if needed.