Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8770bc6ab0d8367e16eb4e30f610b4b1c6cb584e19516aa3dcab01ed2c8e35b' 
  AND token = 'vBsTdiri+rDypJnsnq1Ze2BW4LQQCtJ1GCvZ6gnJUUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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