Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6815ba3a901e38132f143f8d594d1ef3d166aa9fd8ca6ebcffb71c2c748d7554' 
  AND token = 'w302eXlEVEimSulJoaHISYOwNDPNSa0fwj1TQPj/WGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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