Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8e8dfbc7c1a6b22f39a75fc4fa675f2b28ec638609a8ab7e205650f45c9958' 
  AND token = 'bRsLMmNhm09objoJCroD1s6XkKxvD59j9dgEzcGmQ8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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