Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffc6c3b692e8c0766dacfb38708561a6a2384344a9d4aba8996c5d22de36052' 
  AND token = '1QO9m3SMRYGH7BC8wy1Ef11Jjmyi43N7RXHwPv0QVrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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