Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36ee2fa21ba169b85987baf54aa9d8533c40213381dd6ae5aa95f859ad5258a' 
  AND token = '5zdLKgb0srI6CPDPQP17ESwE4n7yF9FIkyeTmxKutOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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