Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cd1d5c63a352b41a714a2a436b1fbc86541cd0206157d4510e4b886d44eca2' 
  AND token = '4pgVr8SZ9LAP9En+sbQ5DJVRB/BBtmHnjvnCh1dvEcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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