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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '559996f012c53b9f8263c870e01fe3fe463d06cef4c5b9bd76790040e897797c' 
  AND token = 'mba8ETdeFyAbzs97yuFrdHsnC0vZG9DHU9QHlGA3CwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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