In a bowl of a stand mixer, put yeast, sugar and water together, and let stand for 5 minutes.
Add flour, salt and olive oil, and knead with a dough hook at medium speed for 15 minutes. Put the dough in a medium bowl, wrap with plastic, and let rise for 45-60 minutes until doubled.
Preheat oven to 480 F (250 C).
Deflate the dough, cut into two parts, and roll into balls. Let rest for 15 minutes covered with plastic.
Roll out one ball of dough into a 12" diameter round. Place the dough on a baking sheet. Poke the dough with a fork to create holes evenly across the surface (to reduce bubbles). Spread 1/2 of mayo on the dough, and also 1/2 of cheese. Scatter asparagus, onion, tuna, and corn over cheese.
Bake about 10 minutes. Repeat for a second pizza.