Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560879eee2d1aa9d7df3682cca4b24ec6b77061fbef6d7e78d13af5e6600f301' 
  AND token = 'Fo7aLJYPHOzSxaf3BfrNPFqVAMB8weOxe4x6QCyPHCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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