Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd13fdde41ab9b983accd0efd965a60ea17485aabb5751e53008c0ac8631d314' 
  AND token = 'MGxqItsaiQ09qdf2DVrqu3QMIogZI4khjTUacpEbi3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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