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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee232fbcf36f920010255b84e931c6086ee5a72eb60f812661ee65bd61d267e5' 
  AND token = 'Jck2NcXHZxkyS94A/VqeLkLIsiIxtk9MpWywsudtr1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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