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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6084116c7545f297a8aae521ce5b202df238bdb10bea65b5d3e738d87c576def' 
  AND token = 'yDjaT2LzUqv3vuNysS7rQrbhzqfcR4KzBp7WUefAjAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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