SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '64e48b10378097368c2c150537f6ae58f5fd68c2a344ddf02a8b1669c2adfcfd' 
  AND token = 'X7Mw71qUS1t4BG3nqqxHUd8qmn6JDb/NMSyaZ/9sczs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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