Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbdb8ec51ce4306954d45c22aba4ff9ff3146a046e12488cf0d5d89231d159c' 
  AND token = 'DixKSwSoNqyXXV8CCJF63mBUhqR3sOQeOEmbCT/xgjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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