Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf830ef78ba37dc1c1e898801b5907daa06514bed86230a4a5ec248da0e8e03' 
  AND token = 'Q/hJxoaInu7WIWfPsDmZ8QEXP+qlPhMjEkKy9zEX0mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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