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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '835156543ae00a726a4fc6cc7e7e7352aaf62928043373f27048ab06f96ad4e4' 
  AND token = 'B2fohNUVe+OabtUVzh9Oa9AIrEx+7atfN5/4tjwE9Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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