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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '585ee1cb2771491705b311cd8516328634efa9944ae78aa449b6e87d763d009e' 
  AND token = 'yXYfWoykskLXM4h9iZayaYZ4gnokD4cIAbd7oay25uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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