Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287730d5b5be2c61dbbc5abf33a2203a8606cfe09bf0071e9ac9aa29f4ca5120' 
  AND token = '3mPHBjYTHoiox8RhjS9hcyYH+Pph7AjZBb+gOdLWXe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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