Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3960570beb9a82584b62dbca52c6977a78a060ce36606b4314fcd19382822a4d' 
  AND token = 'J4bfnGJYzd9ArKqzY3lJw+bcsZ8XGy/H78lKEEXurck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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