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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a28b8d35d810d75b0739221de019fb4d3d49d24fbb6375494a9effe31c0e113e' 
  AND token = '5C1LMpklr3XuroZ6lT544tPK/j08xGtIrmG4sMqdqVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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