SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a9832b7076ac37e6caf32922e4f82b5d349f4ffe1d7bc1faacdc42a925f0b01' 
  AND token = 'XDPWBg5oVRgqGTlyjV+ki5YVuUed5SMb+LCIpZbMf5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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