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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7c897dbb0f97bd544c926fd029eb585fb64ff669dbf4abbeb690af3da26c9ad6' 
  AND token = 'cj5iMLxKlOnMRg79T/jE+U+XZDk0EppD+UmdQ5Dp580=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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