Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998e0aba3a583721efa6118bef76cc4de0cd6c6046864111221c995b2b9a5ed5' 
  AND token = 'X43cRlhOq4ET6M8mb/8daunw7D+VSjy/3XBm6CsHlGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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