Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab5296bec2973b9d3c21dc4eaa5372c8b24b0e4dbd76900eacd28fea59bf86a' 
  AND token = 'sSoMqRSe9KNGCrGuneAVdFy7rAu3csTeZydn/WAKWqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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