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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e1be17fc06da266f891d968f31806aef576f8158d440e6bd2c33d83c6a43d674' 
  AND token = 'knvt/fkcbhAXm+WqzNRA7QtWakwLEkcCtUAn7bXnYn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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