Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ab50c276d3698c664b9eeeb767f76776dd64b2395393721fe4337a2ad944c4' 
  AND token = 'GxZE00idfszCz6bCflWPDzJxCTlivcF+OGZ2tp3lbxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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