Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf990515a2a5ae5e9a7482e783ffeb69633a807a6543e00b798cbadca92cc6a5' 
  AND token = 'eOq+JcJrnRU455lX2HwgAMshwdTWkUrGzNUmklS3iRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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