Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3674cf62671c981a33169137b9648d78b8d56f7d1ddcc2f43d47d94befa366' 
  AND token = 'mhUhs3oneedkumiM+1gkcNUbI4ib3zNmW/Dcrvu+sRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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