Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45d4f12cd5fd62fada11a7a5d00ae4834bee6cfeafdfbdcab3b1c28440c3854' 
  AND token = 'rkUEuNc8AqVCQrjcfYLMBFkMfw/9RJBbEki4yR1orjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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