Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec29e9b4726058e6f78abbb5f757957b198ed084a5deff18bfc5e63fb0c8a8c3' 
  AND token = 'OOE1SuOW4Cfhz8s+ryDNVu1tOdo1mh+KCqoheCrvjVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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