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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c969ba01fa31eb1b5116c01b05db3e7dc214710e28e18003acc874f9bf0391f7' 
  AND token = 'NzBaEU1YRw3Yw9h+zuV13od7J3I7tnCWUiSw9AIEh9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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