SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '680fd20d1157ece29ddb3be471871aa8af5e9ef668502b25b230af224bf739f9' 
  AND token = 'KdWe9Uw9lPTpTsHs2vYbFAmSpmuv/4f1h40Kyjtolzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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