Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4690c7e44c4004790104a63facf66e7929d26f03e91f733f893052faa07cce' 
  AND token = '5Imgfzozyb/lQGd8n5pJk/t2Nfji1/imBHgN+CS15Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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