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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e230ff5d52a56d8cd21a8724c0306a207f8e2e9e133ceabcef202aa99a092681' 
  AND token = 'RJIOON5a2L71kSG7sXC41ytBme1JsTZ/dw64uOIzZaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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