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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a10d9261dd3b852045bdf41411cdcc23d5e0299f1edbbca7a5d4c41304829e34' 
  AND token = 'lM0EBCCs/+mblvQwHldp0Ff4IKpPbdl6iIgJY9JhhlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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