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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3ea4a3edb5537a19492314613e216cd2502cc95e5775eb54dbe0f2e105d682db' 
  AND token = 'W6QCbzXqeaiStxImY/G9TgepWgad3G6xqPM21PKvQiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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