SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4d229ba855564d1de4464a14a751ab2a86e7aa8c6b767fe3fb6bce65948c3f80' 
  AND token = 'Vn0Hok3QI55Qp9dCAJAenwtHgmmMcKYdx3vBdjhrJRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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