Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdbb40c7f0a2415611c822509b07c4d650851d53a2a7d205b98ff3a27d6d117' 
  AND token = 'OQqzEDXRxMVKH5g7Mer8dhnQAalRFplqOJpseaRCqj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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