Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63e471807b605f10415852b339a4c5945d3205a0729139126a861d81613270c' 
  AND token = 'p5XwpWE0baE2R5dJ1AOLKrw2jjW0taU96fsssx6cSlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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