SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f025205c5b942504f325ec1a4c82a22cf11358c87a731c314647332af77a98a9' 
  AND token = '7VdzuX7buAvR+gc6PhABfQpjgUvzuuYBJefH8vzVP7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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