Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d6c67c444b5dcb2ac8a2f051dd84d376d3a3b3707ace5c4facc1071c2b1672' 
  AND token = 'f7Nvb5lZsBWjabm44BYQp4ZjXk+FCDtOJIUIWKbSF3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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