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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9ee455eab181aff892dc9ba48cfe623ff667b5471ea56e81e57ef713d1510363' 
  AND token = 'bqxFn7GtD3VlHQg91AsSDC04DPD/Y8lb4Z9Wg4T6eGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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