Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993661e38d4afede03d9a4ba9b40793858eba65adcdeff69ed917c50a7388f2c' 
  AND token = 'uCp9phl/YibUl7Si26MjcLhrreeywoY9Z8jLLaJaK5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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