Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e7d37b7fd3c0943938a117bbb6c3dc8dc97d84dff389b2e640f91915bea5e2' 
  AND token = 'ELyew693rmDFXVCQMPobAenI1nSuuyHXqIjuVtjTpQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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