SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '433dee4e915b2b8eff714fa031cb5ea3707d2a5af0ef49f6869be71422e3de16' 
  AND token = 'XXDhCVOb25KHTvy0P/JJMGS6WmAZ6HDVDJIa07wE2wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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