Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd79d18ceaeff74801fbc351d6981d015ebec86185fd1e6b770312e7168def19' 
  AND token = 'DNOSseG0KxTGmQd2Fybi7ZF3K4OK1jrZ52qNaaXy0Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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