Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd21af8ef8be1f04523955962dc41edb402d5d58a4228c3160c468ad95f141beb' 
  AND token = 'ZoBU60tGaGdJa4POKm8LQhKlaV3cc5B1cfzQs8kCzVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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