Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7428bcc5881acb73e486d77d4041dbb0b8b1f5f8595a874f187c39b0788127' 
  AND token = 'B2rFW4L5gp6IYSf0SvbQv9OAO1/jE+BMdw/WfYg5zmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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