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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2bf2670dd1c7c500509bb3bcbff6223ba11671d3ef11058ece7a994639d67f94' 
  AND token = 'I0+IWmzvJzXe2RDbKD0VMu8nPJD+lc9rlkuv70ArQe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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