Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee028d87b67e20c7eba0af43d81ae2bd52fe433b4b4fd0913614d072c658e70' 
  AND token = 'HPAtZK8JQQ9fR3U9ytToTzwOGtaEGSqQUgnatZZ9OY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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