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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '14b3d2883564f756c6944506ccb1a4a6662a5ca898d645cdd303404e855430f1' 
  AND token = 't5dz8GJ+7WDHvXPt6S3C5D9qF0jhRsuUTNuZO9B4GG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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