SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6dd17082710b5fabdbfd3e919f70ca92cd24cadc1f7dd410619985e0a813bb72' 
  AND token = '0/ieiEnPJ2javHy5m8wbKE4Ar/q+8v6lHMCez+kJWmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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