Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a33b6562148c442e302e76f128d32ad1721c0cb13977f606871ae15e65d488a' 
  AND token = 'njE8eTQoFzd6ItOsNpiYOiXbnZtVRElJgHtmDhzFVPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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