Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed20b1d2ade8c80b37e737835a497d41207278bcbfdebcaeb31f188d0f74a14c' 
  AND token = 'VKQzSSKecAVywUW6yh6VcTU5e0Ek8pzG0O0JhUmOV2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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