Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6559074ce0f1bec8eebaa507f290bed85e72c94f3e0eadbab933e83f96f5aaf4' 
  AND token = '2hK26HIuYt/BaA450GTdpB3seDjj+FSgVY1YMQc1C78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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