Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd373111203ea9444d64e1fd88516050c5e4c4f9a9b90aa5883737a8013a8f9d7' 
  AND token = 'n1BSBwQIzhehh0Y+16Eiwba0XdcvmX5TtjMrgCA09kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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