Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccafda94bc190a5c7edf5e05380389a1c28303436bc925ed66ddc90dfe5df78' 
  AND token = '2OwpoiRk7kUERQfMs39EDNxk5OsRjetOdoWIfCDpu1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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