What is the qq flying car single-rummaging treasure chest?

Treasure box reward. QQ speed, after each game, there may be extra surprises. You may get a treasure chest. The treasure chest needs to be opened with the corresponding key. A * * * is divided into three types, namely, golden treasure chest, silver treasure chest and bronze treasure chest, corresponding to golden key, silver key and bronze key respectively. When you get the treasure chest, you can check it in my belongings and open it. When you have the key to open this treasure chest, click the "Open" button to open the treasure chest and get the treasure inside. Treasure box keys can be purchased in the game.