Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ffdd8a6fdf3518033d7eb28e83127cb25d220d171e207f6a309e6472502c2c' 
  AND token = 'xyBdfZ6RYtpZPzVscXibIuCJkogNYJnlqA1Fpb+/JNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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