SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6a018bf911e85883e1e0c6de8c9a59af278c237fb2d5fc37e70686db1b121486' 
  AND token = 'ixy4GQV+PZcJDoMwIUzbC/a5kDlFAcjVEfoIKw+X7VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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