Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f3789440e2d045df5ffff59da957f364656a8dcb21d0f67bb99a627f8c2698' 
  AND token = 'qYvYbV1loX1QEAPYVo8592FWjTCBiOTzeoIwcaji+Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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