SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9d6413bc7c762068eed8a910d36512f49a49a682c6c29a865851944f738742f1' 
  AND token = 'T9IyvPLccUnXUqY75T0HBiZSKfp9EzjIWJ3o8zNuDk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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