Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef30bfa6fbe35a1282ab1b2d20e69157cc75404b8ddcf17a4962119d0cfbaae4' 
  AND token = 'eIfoQGBoympDxYfoLcUdX8XCnrfnAZsxhr8wKBEOj7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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