Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8d2a04335d87ca5de71652386ab0d656f1283ca37867de5cf29fd6e3c56dc6' 
  AND token = 'kh76kbE6TgBuqdNStdtTE50ZnLIEiIsQyj69tCVqDg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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