Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6adcd0700bb0d47b58c641174ab89254f71af2cec5b7df885f9cc39e70a4f7c7' 
  AND token = 'c+VEC1+VNXm0MtIkB4Y6HTObYpVzS+7nm8KM1Q+WEk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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