SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a177dbc9bdc840c3f8d82cb521932b8a862d60ac947ff66fb761373b9a1a51c8' 
  AND token = 'ypl0CXwtvJQnKV611Zew0ArJYhxRFFBZqe+wubo/ijI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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