Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8ab8abd4ed3a82d203a229c76d4cd068ddfd0509716028b0175cccfc682354' 
  AND token = '6aWaoCzifQJjvIFzg8QYf5RVf7mv84Kg8Zy/84qlRRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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