Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5df965f3a923634ad46be295933e61430f9d9ed9543bbb7abf4fb5e8eed6c4' 
  AND token = 'ujrzU0ktcfQIozfRJHfC5bjuWCrw45ggzAodH4ZaRCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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