Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390709d9be9e55f7ec80e65342308e6dbe3f07ae03ff58db58a29a772d61a781' 
  AND token = 'RQh1TbwbwZXo2PqvjR3pVO/iV1BYgIEScwAznte0pQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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