Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '332cedd5ba42f5722acf7d42e87538b805dbe316e2e8731f71aee13ed35c5394' 
  AND token = '1mYcC19Ouuf7LvRPUTbG5vK/j05rJ9nKZq+cC/zb7AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}