Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97f17c58666dc1620adb206f62c7651e7efcf40b0c32a8b1c40ceffbf7260e3' 
  AND token = 'RV2MrTY0WnrtCsC6CQ5wfWBjp3dgrzHjTjLCKT6QRdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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