Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b82b5358a5dfd9b85950b6b7303a070fa481c5d743670fe392982c986e54df6' 
  AND token = '9vmtoTj3aGdjO3cAR+okBdqT6E8qeWFTea6WMlZV+gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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