Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9468ee3cb4dc4591bbe65ab1548cfa5efdc90e4edf6746a66f7615cfc657603' 
  AND token = 'Zcd6NuMEFdI/jCBMnEHZMXOTbSCs3t2Yktl6ldKQ09I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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