Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91f2612a77fa324d534b84541a7f16c708112dd36402c8a3865dca6f95591ff' 
  AND token = 'u9m5hYA2ZcKcYQlw48GwbtFJRX3cQN3fpVsSEKyjPyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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