Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5944990151fc4f0d85d8d3deeaa8da9aa6cdd44a1b8c08857ed20a7a9ec5cc' 
  AND token = 'ZfksptqR9HEtepwT8Wg7g5MXpk38hLzgD51J0hYlFMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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