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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '71844819bb6a9dbc23408ec02d430361cbd5e3a7497233e4c803ecf37a2d0ee6' 
  AND token = '9dP3yET7z6Ko/HHZQxof2IZ5tNJ5syPDFx7iVp9Rlbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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