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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5d7622dcaac015479957a35bc6d33b56288ceb7fce7af39dae528c632e3447bf' 
  AND token = 'OhgEfGzuQ9O3G1gI3I3vJqlnOI4TcDMb4iF/3tdsQI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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