Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9480f6ec77b0e3f4478c10d3ce470fa9ca575ab12a3f8945b25ae836539719' 
  AND token = 'EbHddiSaZUJp5NvVCnXreNDqpbiJCaIZBZ0zbyPodGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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