SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0a177e81b8d56bdda16779f674e368a9e295f899270c0f35cb3983f454e21cd0' 
  AND token = 'ljtUCpP33stDRBwU/5cI5tpXYA7ZFr9qU0i49ir5z2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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