Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4a98d76d79c2e09f6723eb58ca61cd2c8f8ac727e0866a1feb38a76f49e29a' 
  AND token = '/TCuDwm7e0WOqsYoMlvWUqwosjCAY8zNWIDERuUjgSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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