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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '347d55b8eea79a58355b73f48efc77493e4bef4801ae418c1a77cd7610e4d093' 
  AND token = '7e4Q+xZWKasF3xrfzkTpI2/LV3RY9a9iuOg6q8imh5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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