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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '652ce4cdbd863d4a4989ae01efbc1202a37c24c16a8c7404d28cb4520974b847' 
  AND token = 'NoJmI83lL8i8Ydo46lYT9SfL+NAxqD4lJfPnsg+Vg2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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