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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '273ac049c1969b0ec834596c08bb05ad8efe1eec89d5acd8360ca2724bf09d4c' 
  AND token = '6DIOvkYLv1B03SUA0GpnWy+mnyecK+eJcKKUO1JHczA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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