Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f52fc5436a4a6050b74ee0f61a7cbe3ca16965d6dd4fc53bca39d49f34641e' 
  AND token = 'DjW2pCFxY2VJCs2heZVLshfeETKWEIUa+9rtYrZXShI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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