Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b117b730c1562838f6b500b71b068b2b9726820cf3c2409cadd3c5c70d6780fe' 
  AND token = 'MFqZvlkHAXQlPnGth1RLGdOAwIlW0EgA3yQoWrmBOmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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