Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0e4dfbc358a3de2cf58fc67809c6ccc5ca859e64dc9d871bd2254bacdf063e' 
  AND token = 'PHk3WEzhFpceBYhHgz+UJg+sR+UXrOWT7ZIQXqAtutU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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