Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc0b797f3d9600c58b769bb8eeb649df19354ebd7816c4f7dadf68c3cf0f7da' 
  AND token = 'NqT/2/MQ3O06heKy2f9Y9RH6OGjagMNk3Yw4D8ZEMgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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