Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed55e06bb73e532e84da4dff9c9140dc5d90509acf0f84e0fe56e0df0e46ad5' 
  AND token = 'HN55w/NoslhdknQNdP/ZWrOtt/Io+DpLgRx9v+P6TXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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