Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f02ac825ae374a2b841369295e86af37eddd2ff5f4fb5065ba6ba7c39665c94' 
  AND token = 'PNuxxf3l6dpXjfq3N1jHoQyDD+z7nGS1gfuyiovCSiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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