Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7f0336b328f7ccf5880ed986a2cdc5454cdd70101250791e0f70efdc1b14c9' 
  AND token = 'Ft9SQjCq6WPTF2FTvoEhaJZwuPI0Z4y7AWmxht5QpM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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