SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9e59036d05bf47e6e66ec7782b1952f2bb5263212da0256775d52450388fe3ff' 
  AND token = 'xx3/Z44dcZH7BFRb5uKgcWGV0TeLMxXJcUxvBDItQxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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