Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33015246634895fb29aa09d8915fa7b80a1d30508c83b419ad919135dc838a35' 
  AND token = '0m7utq0qeMDn9E1QJ/+ZhqiHQfT4StC2DCE8lIdjuzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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