Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe3b4de080816b3673f1e07e005428277d592dbe0b3332fa5e8da166b2bb77f' 
  AND token = '4HM2U5/eIf1rDermZyqHthpaHXg93SfDv2cgez62tAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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