Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a968def7d6c00bc75e3bd1a7214ccadd5ef4a2cbc5f348ff01585cd52fe62456' 
  AND token = '5rY56o+loPz1OPsCDJjaDSpKCklq5OIJO7g0U8Fj1kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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