Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0f23706775d767585be3f2bebdff8a7cb285fbf87d1f9584355af1d8b70590' 
  AND token = 'Hx+KbJS43ikLyd0SQoTJ/0K+rCIdpbE6Dz+BWqsQUU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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