Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3ee5ac6a85eaaf814812a05a6bcd338fd48e5b6164918c063e4a3bfc7e8529' 
  AND token = 'd/rLBHppVHx8XMeF1ew6GDJecFwPgy5h3kDbvJKfoys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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