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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '19eddfb717326e8fed00bdb8136164fc16f6617d259a75f52338116336f596ff' 
  AND token = '4OWj2ZsLK+oD5q5M8r1WfJhQRRcLF30yWy7dndVl1nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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