SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2b442bba0a2fca09c82ae58b8094327d55883dc0cc4a82383d739764730259e4' 
  AND token = 'KfSdqgCQTuudlQdf5wBV30XQOh5HIraH0uFZsCrSqJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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