Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44acbbe1ad558b536584d99ee016513e9b0888f913e5e9dbd8d17b3611ed571c' 
  AND token = 'VZn4igAFd/NxlbLccZPYf+kYgKLwnkZRRRlvnrlxXRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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