Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c212bec4fef0e388360aef66510ce3263263e33574a40ca720a6635731f324' 
  AND token = 'abB/MZbRNboCmRUcDC0Mhq0WwxspS3SDQMRxni9d/KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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