Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998c770a5b8869e69f4073b8fa7e5f00de6abc9b673ba8cf33f1c33caf572e7f' 
  AND token = 'QeyzUrR/dFIfb5syupBGbkSHEqeWP6LP8LmaNlO46NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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