SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0029da8819552f8bf3a0ea4e89922c65f2e94face3b8856516c58a336a851707' 
  AND token = '/jjEZxXuXTj0Erh6zClhUYJFR7XzlZhAkffG7QYf3Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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