SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '23fb48ab0d0ca519c4ef039c6cf10ab27f97e487c63d8a99dd784797d59192a1' 
  AND token = 'NMBzA4YFZXhRRJIGMY4GQHmPrz6tmI+CLrvqdxiTUhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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