Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347a2b0d03032cbffd006e9ce8ee7c83beaf7b8b7ee19ebd6fcb7706fd534b33' 
  AND token = '8UoTantbZ6AM5YfFjS6fbJvDBBfgIYTh4DO8XVEUHac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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