Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4527bad8bbacb335fc87edd435424c92a1d67c5b650c1a4cda5ea343e4d520' 
  AND token = 'hlCxX7wlKe1WYHR0N9jVemIi1p8FXrL5S43upLKTyrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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