Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42146a938e92496e45fd1846ad58b2a32bd475c2cbd6e695d4e8f8746b327157' 
  AND token = 'DjbkEzTeegSQ98VzT2QwRzas9e7WynRo+JCKdXKedos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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