SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2bf29bb4a0c197b3fbe12c37fb7bed08eb90f0db4eafa2f2d592dc6d4b371243' 
  AND token = 'FTKiJNn6gC+yESWFqVKsp8CnS/AKP9oMdYyvC3zbkDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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