Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5756371480053692065d846174bcd27fe9f59527b3b7e3a1dc28d5e24288580b' 
  AND token = 'iNK0YfBGmRzHo0WE618hCkaecW/zvtjpfGxQNMAbKbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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