Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f126527f416191431b9250c93e24cdd2c273cc6dcada972d2104fecd7d661c' 
  AND token = 'mq7kVcpn2Eke03HEGu4aeKT5l2kWmYrx4s7Dp/eoLLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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