Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15838257efae282d0f4f392490157e952ed5e21c9a560b26f7f818883b3753b' 
  AND token = '/++DyxkyehJB1dqIhuhtkEd612ez/TxUC1bHblZvsQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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