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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7f5f59705a2fe8044e218b7767433682cc54ef2ca426a0c5381f58c1908f2a02' 
  AND token = 'WIWqK5YxSaXwB/IQTda/atbKrf27a8CXU8Sw1R1MQI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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