Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4cf73b4d0c43f553f9fd6d89b445dcb1f2f8c2ddfdee59507149455057fa8a2' 
  AND token = 'lhO9IW8rFDIGPFu5wTBt000BnG6bdRwnQzlM93Lg0tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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