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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '09ddea6fc42f827143dc91e42541050f3d5872ca8f44724b8199ab34b57850ac' 
  AND token = 'nc5dgha7+LAVNxRm9S6MBxV3U0yui6Xe7y0lSamyy50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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