SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'efa59145f80d6c9af59034c400d6d8bb3fc6dfd736e1f22b7502a4ef72695f38' 
  AND token = 'kp7qt99L0TT5BTL8paisrrpDY87KVvMmJO3+JesnUmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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