Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1ab6ef6b0446ff0edb96f469f53878197a619b5532e7982ebfd1c8457e97d2' 
  AND token = 'gqnRxVmNrPT16/PMgmxnaRVt9DWGvNicUhbb4D9J2aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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