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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7f7f3b87471b5f512ea736dee16185ab41d29af02056ae0f7c20ff06692a8e96' 
  AND token = 'tIbRzpCHH45NDVwsxwXyZTp39R3f4ReUAlV0DJzt5JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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