Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2281351e37b7326201e664efb0c8cc381705aef10d580b81321c41b12b7b5df6' 
  AND token = '2UyFzJXquz9GeOrRlQhL6f104NcKuVlcpTgHaDOjmnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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