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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '47ac2af0ee76e4833419a345017ead0f8709860be9497dae012b9157cf1c9a8e' 
  AND token = 'QyudXO+wkOBOMRvb+gbR7A6Uej+CMUVFU5jx9ijD+04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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