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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f0ed01de0a506aeb702a61bf5d4086b6897ee62364b80fef46213d3f441e9846' 
  AND token = 'ZDIgIf57mJSycxNds9rsz52cEH56ADTmHc9Iz5NrfW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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